Fig. 5
Observation of a Spin-Orbit Electronic Wavepacket in CH3Br+. a Spectral line out of the attosecond transient absorption trace depicting the composition of the CH3Br ionic absorption profiles corresponding to process 3. This absorption profile is composed of three spin-orbit transitions labeled as L1 (red), L2 (orange), and L3 (green) in the manuscript. b By summing over the three spin-orbit transitions, we can uniquely measure the spin-orbit wavepacket dynamics generated by the strong field ionization process. The shaded curve represents the measured uncertainty in Δ O.D. A Fourier analysis of these dynamics (inset) clearly illustrates a spin-orbit wavepacket with a frequency of 325 ± 2 meV, corresponding to a period of 12.7 fs. The qualitative picture for this process is presented by the electron hole density screen shots for CH3Br+ depicted below b, corresponding to the oscillation in electron hole density between px and py character about the C–Br axis
